germinal disc vs layer

germinal disc and layer both are nouns.

Word	Noun	Adjective	Verb	Adverb
germinal disc	Yes	No	No	No
layer	Yes	No	Yes	No

As nouns, layer is a hypernym of germinal disc; that is, layer is a word with a broader meaning than germinal disc:

germinal disc (noun)	layer (noun)
a layer of cells on the inside of the blastula	thin structure composed of a single thickness of cells
	a hen that lays eggs
	single thickness of usually some homogeneous substance
	an abstract place usually conceived as having depth
	a relatively thin sheetlike expanse or region lying over or under another

germinal disc (verb)	layer (verb)
	make or form a layer